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Started By
Message
1
Posted on 6/24/24 at 9:09 pm to FutureMikeVIII
quote:
I don’t think this one had an emergency spillway, so it created its own
The dam would have overtopped if there wasn't an emergency spillway. This dam (in op links) is not overtopped.
Posted on 6/24/24 at 9:18 pm to deeprig9
quote:
The dam would have overtopped if there wasn't an emergency spillway. This dam (in op links) is not overtopped.
I feel like we’ve been over this. The dam is flanked. It’s not overtopped…because it is flanked. I don’t think this dam had an emergency spillway…prior to being flanked.
At least I don’t see one in pics or in aerials, but I’m an idiot.
Posted on 6/24/24 at 9:20 pm to deeprig9
quote:
The dam would have overtopped if there wasn't an emergency spillway. This dam (in op links) is not overtopped.
I haven’t seen any pics or videos yet from just before the water found another way, but I have seen a couple that seem fairly soon after and still had some water on the top like below.
Posted on 6/25/24 at 12:10 am to dallastigers
Posted on 6/25/24 at 6:02 am to BayouNation
Day 2 LIVE feed
ETA: some are saying this is a looped feed
ETA: some are saying this is a looped feed
This post was edited on 6/25/24 at 9:23 am
Posted on 6/25/24 at 7:04 am to BayouNation
I think this is a loop from yesterday.. rewind it and it never gets dark
Posted on 6/25/24 at 7:11 am to Hotgin
quote:
I think this is a loop from yesterday.. rewind it and it never gets dark
You've seen Speed, haven't you?
Posted on 6/25/24 at 7:26 am to East Coast Band
From r/civilengineering
It appears that the blue river from USGS data is currently flowing at ~35,000 CFS. This should not be an issue for the dam, as it has seen such flows before. However, it appears that woody debris has built up and blocked the tainter gates (the radial spillway gates) and reduced the amount of water they can pass.
Debris has traditionally been low on this river, and trash has been removed at rapian by hand rake or by excavator. In large flood events, however, large quantities of debris will suddenly overwhelm a river. I am not aware of upstream debris booms, or other catchment techniques that are utilized, but there is not a modern or automated debris removal system capable of large debris inflows. Debris blocking spillway channels can cause their effective flow discharge to decrease by anywhere from 5-50% (sometimes more), especially for these relatively shallow tainter gates at Rapidan. Meaning the dam in a debris blocked state may have only been capable of passing 20k CFS. An insignificant amount of water can be passed through the powerhouse, so relieving pressure through the powerhouse is not an option.
In addition, the reservoir behind rapidan is not very large, and cannot “absorb” an incoming flood very well. Therefore, blockage in the spillway caused the water level of the reservoir to rise quickly. This may have happened so quickly that operators did not have sufficient time to respond. Water levels raised, and water breached the left levy, and quickly eroded and cut a channel.
From news observations it appears that the left thrust block (the dam's left foundation) is founded and wedged in competent rock and may hold, but we will see how things play out. What’s most important at this point in time is that the left abutment holds and stays wedged into the rock. The right abutment appears to be in fine condition.
This was most likely a preventable disaster. This flood event occurred over multiple days, and measures could have been taken to prevent the buildup of debris. I think that an over-the-weekend flood and perhaps some negligence caused the owner to not be prepared for the clearing of debris, and it overwhelmed the project quickly.
I send my best wishes to those in the immediate area. Please follow evacuation orders and stick to them, in the case of a dam failure there could be a very large inflow and flood.
It appears that the blue river from USGS data is currently flowing at ~35,000 CFS. This should not be an issue for the dam, as it has seen such flows before. However, it appears that woody debris has built up and blocked the tainter gates (the radial spillway gates) and reduced the amount of water they can pass.
Debris has traditionally been low on this river, and trash has been removed at rapian by hand rake or by excavator. In large flood events, however, large quantities of debris will suddenly overwhelm a river. I am not aware of upstream debris booms, or other catchment techniques that are utilized, but there is not a modern or automated debris removal system capable of large debris inflows. Debris blocking spillway channels can cause their effective flow discharge to decrease by anywhere from 5-50% (sometimes more), especially for these relatively shallow tainter gates at Rapidan. Meaning the dam in a debris blocked state may have only been capable of passing 20k CFS. An insignificant amount of water can be passed through the powerhouse, so relieving pressure through the powerhouse is not an option.
In addition, the reservoir behind rapidan is not very large, and cannot “absorb” an incoming flood very well. Therefore, blockage in the spillway caused the water level of the reservoir to rise quickly. This may have happened so quickly that operators did not have sufficient time to respond. Water levels raised, and water breached the left levy, and quickly eroded and cut a channel.
From news observations it appears that the left thrust block (the dam's left foundation) is founded and wedged in competent rock and may hold, but we will see how things play out. What’s most important at this point in time is that the left abutment holds and stays wedged into the rock. The right abutment appears to be in fine condition.
This was most likely a preventable disaster. This flood event occurred over multiple days, and measures could have been taken to prevent the buildup of debris. I think that an over-the-weekend flood and perhaps some negligence caused the owner to not be prepared for the clearing of debris, and it overwhelmed the project quickly.
I send my best wishes to those in the immediate area. Please follow evacuation orders and stick to them, in the case of a dam failure there could be a very large inflow and flood.
Posted on 6/25/24 at 7:51 am to crazyLSUstudent
Posted on 6/25/24 at 9:22 am to SpotCheckBilly
quote:
I think the house makes it.
Posted on 6/25/24 at 11:19 am to sqerty
Posted on 6/25/24 at 12:22 pm to BayouNation
Short 4 minute news clip from fox9 from this morning
Thought it had some good still shots, apologies if posted previously
Thought it had some good still shots, apologies if posted previously
Posted on 6/25/24 at 4:25 pm to sqerty
Posted on 6/25/24 at 4:29 pm to BayouNation
quote:
Drone footage of house foundation
The root system is fascinating to me.
There are 15 ft deep and thick roots in the front yard. I wonder what those are from?
Posted on 6/25/24 at 10:41 pm to Hotgin
Posted on 6/25/24 at 10:45 pm to carrguitar
I hope they were able to get some of their belongings out before. That would be terrible to watch happen over multiple days.
Posted on 6/25/24 at 10:47 pm to redstick13
quote:we need a ketchup
redstick13
Posted on 6/25/24 at 10:55 pm to OWLFAN86
I need to make a trip back home this year. Preferably when it doesn’t feel like the surface of the sun there. Plan to fly into Houston. We will need to make some plans when I know dates.
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